cleanup and refactoring

raytracer/nvpro_core/nvvkhl/shaders/README.md

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+## Table of Contents
+- [bsdf_functions.h](#bsdf_functionsh)
+- [bsdf_structs.h](#bsdf_structsh)
+- [dh_comp.h](#dh_comph)
+- [dh_inspector.h](#dh_inspectorh)
+- [dh_sky.h](#dh_skyh)
+- [dh_tonemap.h](#dh_tonemaph)
+
+## bsdf_functions.h
+### Function absorptionCoefficient
+
+>  Compute the absorption coefficient of the material
+### Function bsdfEvaluate
+
+>  Evaluate the BSDF for the given material
+### Function bsdfSample
+
+>  Sample the BSDF for the given material
+
+## bsdf_structs.h
+### struct BsdfEvaluateData
+
+>  Data structure for evaluating a BSDF
+### struct BsdfSampleData
+
+>  Data structure for sampling a BSDF
+
+## dh_comp.h
+### Function getGroupCounts
+
+>  Returns the number of workgroups needed to cover the size
+
+This function is used to calculate the number of workgroups needed to cover a given size. It is used in the compute shader to calculate the number of workgroups needed to cover the size of the image.
+
+## dh_inspector.h
+### Function inspect32BitValue
+
+>  Inspect a 32-bit value at a given index
+### Function inspectCustom32BitValue
+
+>  Inspect a 32-bit value at a given index
+
+## dh_sky.h
+### Function initSkyShaderParameters
+
+>  Initializes the sky shader parameters with default values
+### Function proceduralSky
+
+>  Return the color of the procedural sky shader
+
+## dh_tonemap.h
+### Function tonemapFilmic
+
+>  Filmic tonemapping operator
+http://filmicworlds.com/blog/filmic-tonemapping-operators/
+### Function gammaCorrection
+
+>  Gamma correction
+see https://www.teamten.com/lawrence/graphics/gamma/
+### Function tonemapUncharted
+
+>  Uncharted tone map
+see: http://filmicworlds.com/blog/filmic-tonemapping-operators/